title: Effect of penicillin on streptomycin-dependent variants in Escherichia coli populations.
mesh_terms: D004926:Escherichia coli; D010406:Penicillins / Q000494:pharmacology*; D013307:Streptomycin
chemical_list: D010406:Penicillins; D013307:Streptomycin
keywords: ESCHERICHIA COLI; PENICILLIN/effects